JP3666266B2 - Hot water system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply system that uses the residual hot water of a bathtub after bathing.
[0002]
[Prior art]
Conventionally, this type of heat pump is disclosed in JP-A-4-106370. Hereinafter, conventional techniques will be described with reference to the drawings. FIG. 8 is a block diagram of a conventional bath hot-water supply system using the remaining hot water from a bathtub. In FIG. 8, the water in the lower chamber 30b of the hot water storage tank 30 flows into the heat exchanger 32 by the operation of the hot water supply pump 31, exchanges heat with the remaining hot water in the bathtub 1, and returns to the lower chamber 30b of the hot water storage tank 30 again. And it is a system which uses the heat of condensation from the compressor 33 to dissipate heat in the condenser 34, heats the water in the upper chamber 30a and the lower chamber 30b of the hot water storage tank 30, and stores hot water.
[0003]
[Problems to be solved by the invention]
However, in the conventional hot water supply system, the water temperature in the lower chamber 30b in the hot water storage tank 30 is heated by exchanging heat with the remaining hot water in the bathtub 1, and thus rises with time, and the remaining hot water temperature in the bathtub deprives the heat. Will be reduced. Therefore, the remaining hot water in the bathtub 1 cannot be recovered to the water supply temperature. In addition, since the remaining hot water in the bathtub is collected and stored in a hot water storage tank, and this hot water is used for hot water supply, it cannot be used immediately for showers, kitchens, and bathrooms. In addition, a hot water storage tank for collecting and storing hot water from the remaining hot water is required, and there is a problem in installation space.
[0004]
The present invention solves the above-mentioned problem, recovers the remaining hot water of the bathtub to the feed water temperature, saves energy by collecting hot water while collecting the remaining hot water of the bathtub immediately after bathing, and eliminates the need for a hot water storage tank. The main purpose is to reduce the size.
[0005]
[Means for Solving the Problems]
To solve the above problems, the present invention includes a compressor and an evaporator and the pressure reducing means and the heat recovery heat exchanger Toka Ranaru heat pump circuit, the bath heat exchanger having an evaporator and a heat exchange relationship, the bath heat A bathtub or a water tank communicating with the exchanger, a heat exchanger having a heat exchange relationship with the heat recovery heat exchanger and supplying water from the water supply pipe, and a flow rate detecting means for detecting the flow of water in the water supply pipe, The hot water supply system has a control means for starting the operation of the compressor in response to a signal from the flow rate detection means, and has a heating means provided in the middle of the water supply pipe between the heat exchanger and the terminal for discharging the hot water.
[0006]
With the above configuration, when hot water is used in the kitchen, bathroom, shower, etc. after bathing in the bathtub, the water supplied from the water supply pipe is exchanged with the remaining hot water in the bathtub via the heat exchanger and heat recovery heat exchanger. , Heat. The heated water is heated at the outlet of the heating means so as to reach a predetermined temperature and heated to use the hot water. Therefore, since the fluid that exchanges heat with the remaining hot water in the bathtub is water supply that constantly flows through the water supply pipe, the remaining hot water heat in the bathtub can be recovered to the water supply temperature.
[0007]
In addition, since the remaining hot water in the bathtub is collected and used for preheating the heating means, the heating heat amount of the heating means is reduced and energy is saved. Further, the heating capacity of the heating means can be reduced, so that downsizing can be achieved and a hot water storage tank can be eliminated, so that space saving can be realized. Furthermore, since the output of a heating means is controlled even if the residual hot water temperature of a bathtub falls and the heat exchange amount in a heat exchanger reduces with a driving | operation, the tapping temperature and the amount of hot water supply are stabilized.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention includes a heat pump circuit comprising a compressor, an evaporator, a decompression means, and a heat recovery heat exchanger, a bath heat exchanger having a heat exchange relationship with the evaporator, and the bath A bathtub or a storage tank communicating with the heat exchanger, a heat exchanger having a heat exchange relationship with the heat recovery heat exchanger, in which water supplied from the water supply pipe flows, and a flow rate detecting means for detecting the flow of water in the water supply pipe And a control means for starting the operation of the compressor in response to a signal from the flow rate detection means, and a heating system having a heating means provided in the middle of a water supply pipe between the heat exchanger and a terminal for discharging hot water.
With this configuration, when hot water is used in the kitchen, bathroom, shower, etc. after bathing in the bathtub, the water supplied from the water supply pipe is exchanged with the remaining hot water in the bathtub via the heat exchanger and heat recovery heat exchanger, Heat. Therefore, since the fluid that exchanges heat with the remaining hot water in the bathtub is water supply that constantly flows through the water supply pipe, the remaining hot water heat in the bathtub can be recovered to the water supply temperature. In addition, since the remaining hot water in the bathtub is collected and used for preheating the heating means, the heating heat amount of the heating means is reduced and energy is saved. Further, the heating capacity of the heating means can be reduced, so that downsizing can be achieved and a hot water storage tank can be eliminated, so that space saving can be realized. In addition, the heat pump circuit can be started up quickly.
[0009]
The invention described in claim 2 includes temperature detecting means for detecting the hot water temperature at the outlet of the heating means, and control means for controlling the output of the heating means so that the detected temperature of the temperature detecting means becomes a predetermined temperature. In order to control the output of the heating means even if the remaining hot water temperature of the bathtub decreases with operation and the heat exchange amount in the heat exchanger decreases with operation, the tapping temperature and the amount of hot water supply are: Stabilize.
[0010]
Further, the invention according to claim 3, the heat recovery heat exchanger and a hot water supply system according to claim 1 or 2 comprising a heat storage unit having a heat exchanger in heat exchange relation, heated condensed in heat Toponpu bathtub Residual hot water heat is stored in the heat storage means via the heat recovery heat exchanger, and used to heat water supplied through the heat storage means during hot water supply. Therefore, even when hot water is not used, the hot bath residual hot water immediately after bathing is collected so that the heat storage operation can be performed with high efficiency. In addition, a large amount of heat can be extracted from the heat storage means during hot water supply. And since the rise of the hot water temperature which flows out from a heating means also becomes quick, instant hot water property improves.
[0011]
Further, the invention according to claim 4 includes a natural heat utilization heat exchanger that collects atmospheric heat or solar heat provided in parallel with the evaporator, and collects heat from the bathtub or when there is no water in the bathtub. When the bath water becomes low temperature, atmospheric heat or solar heat is collected and stored. Therefore, since heat can always be stored in the heat storage means, economy and convenience are improved.
[0012]
The invention according to claim 5 includes a bypass pipe having an on-off valve provided in parallel with the heating means, a flow rate detecting means for detecting the flow of water in the water supply pipe, a fluid outlet of the heating means, and a bypass pipe. A temperature detecting means for detecting the temperature of the joined hot water and a control means for receiving a signal from the flow rate detecting means and controlling the opening of the on-off valve when the temperature detected by the temperature detecting means is higher than a predetermined temperature. The flow of water in the water supply pipe is detected, and when the hot water temperature at the outlet of the heating means is higher than a predetermined temperature, the hot water is bypassed and discharged. Therefore, heat radiation when flowing through the heating means is reduced.
[0013]
Further, the invention according to claim 6 has a configuration in which a heat recovery heat exchanger, a heat exchanger, a heating means, a heat pump circuit, and a bath heat exchanger are housed in one unit, and a ventilation path is used like atmospheric heat. Therefore, it is possible to install in the pipe shaft of an apartment house or install indoors, so that the degree of freedom of installation is improved.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In addition, in a prior art example and each Example, the same code | symbol is attached | subjected about what has the same structure and the same operation | movement, and description is partially abbreviate | omitted.
[0015]
(Example 1)
1 is a configuration diagram of a hot water supply system using bath heat according to a first embodiment of the present invention. In FIG. 1, a solid line arrow represents the flow of water supply, and a broken line represents the flow of bathtub remaining hot water.
[0016]
Reference numeral 1 denotes a bathtub or a water storage tank for storing domestic wastewater and rainwater, and 2 is a heat recovery heat exchanger that communicates with the bathtub 1. 3 is a bath pump that conveys the remaining hot water in the bathtub 1 to the heat recovery heat exchanger 2. A heat exchanger 4 has a heat exchange relationship with the heat recovery heat exchanger 2 and feed water from the feed water pipe 5 flows. Reference numeral 6 denotes a heating means, which includes a water heat exchanger 7 and a combustor 8, and is provided in the middle of the water supply pipe 5 of the heat exchanger 4 and the terminal currant 9 for discharging the hot water. The water supply from the water supply pipe 5 flowing through 7 is heated. Reference numeral 10 denotes a temperature detecting means for detecting the hot water temperature at the outlet of the heating means 6. Reference numeral 11 denotes a control means that controls the output of the heating means 6 so that the temperature detected by the temperature detection means 10 becomes a predetermined temperature.
[0017]
The operation and action of the above configuration will be described. In the case of using hot water such as kitchen, bathroom, shower, etc. after bathing in the bathtub, when the terminal currant 9 is opened, the water supplied from the water supply pipe 5 is passed through the heat exchanger 4 and the heat recovery heat exchanger 2 to remain in the bathtub 1. Heat is exchanged with hot water and heated. Then, the heated water flows into the heating means 6 and is heated at a higher temperature by the combustion heat of the combustor 8 when flowing through the water heat exchanger 7. And the output of the heating means 6 is controlled so as to reach a predetermined temperature at the outlet of the heating means 6, and hot water is discharged from the terminal currant 9. Therefore, since the fluid that exchanges heat with the remaining hot water in the bathtub 1 is water supply that constantly flows through the water supply pipe 5, the remaining hot water heat in the bathtub 1 can be recovered to the water supply temperature.
[0018]
Further, since the remaining hot water in the bathtub 1 is recovered and used for preheating of the heating means 6, the heating heat amount of the heating means 6 is reduced and energy is saved. Moreover, since the heating capability of the heating means 6 can be reduced, the size can be reduced and the hot water tank can be eliminated, so that space saving can be realized. Furthermore, since the output of a heating means is controlled even if the residual hot water temperature of a bathtub falls and the heat exchange amount in a heat exchanger reduces with a driving | operation, the tapping temperature and the amount of hot water supply are stabilized.
[0019]
Moreover, when the water storage tank which stores the hot water of the medium temperature drained from a household instead of the bathtub 1 is used, it has the same effect and can be used for preheating of the heating means whenever hot water is stored in the water storage tank. The same effect can be obtained by using an electric heater as the heating means 6 instead of the combustion heat of the combustor 8.
[0020]
(Example 2)
FIG. 2 is a configuration diagram of a hot water supply system using bath heat according to a second embodiment of the present invention. In FIG. 2, the refrigerant flow of the heat pump circuit is represented by a one-dot chain line. A heat recovery heat exchanger 12 has a heat exchange relationship with the heat exchanger 4. Reference numeral 13 denotes a compressor, 14 denotes an evaporator, and 15 denotes a pressure reducing means. A heat pump circuit 16 includes a heat recovery heat exchanger 12, a compressor 13, an evaporator 14, and a decompression unit 15. Reference numeral 17 denotes a bath heat exchanger, which has a heat exchange relationship with the evaporator 14. Reference numeral 18 denotes a bathtub, which is connected to the bath heat exchanger 17.
[0021]
The operation and action of the above configuration will be described.
[0022]
The remaining hot water in the bathtub 18 is collected by the evaporator 14 of the heat pump 16 via the bath heat exchanger 17. The collected heat is radiated by the heat recovery heat exchanger 12 to heat the feed water flowing through the heat exchanger 4. And it heats to predetermined temperature with the heating means 6, takes out hot water, and utilizes. Therefore, heat can be collected until the remaining hot water temperature in the bathtub becomes lower than the water supply temperature, so that further energy saving can be achieved. Moreover, when the water storage tank which stores the hot water of middle temperature discharged | emitted from a household instead of the bathtub 18 is utilized, it can use for the preheating of a heating means every time hot water is stored in a water storage tank.
[0023]
(Example 3)
FIG. 3 is a configuration diagram of a hot water supply system using bath heat according to a third embodiment of the present invention. In FIG. 3, 19 is a heat storage means, and has a heat exchange relationship with the heat exchanger 4 and the heat recovery heat exchanger 12.
[0024]
The operation and action of the above configuration will be described.
[0025]
The bath remaining hot water collected by the heat pump 16 is stored in the heat storage means 19 via the heat recovery heat exchanger 12 and used for heating water supplied through the heat storage means 19 during hot water supply.
[0026]
Therefore, even when hot water is not used, the hot bath residual hot water immediately after bathing is collected so that the heat storage operation can be performed with high efficiency. Further, a large amount of heat can be extracted from the heat storage means 19 during hot water supply. And since the rise of the hot water temperature which flows out from the heating means 6 also becomes quick, instant hot water property improves.
[0027]
(Example 4)
FIG. 4 is a configuration diagram of a hot water supply system using bath heat according to a fourth embodiment of the present invention. In FIG. 4, 20 is a natural heat utilization heat exchanger, which is provided in parallel with the evaporator and collects atmospheric heat or solar heat.
[0028]
The operation and action of the above configuration will be described. When there is no water in the bathtub, or when the bathtub water becomes low temperature by collecting the residual hot water from the bathtub, the heat pump circuit uses the natural heat utilizing heat exchanger 20 as an evaporator. The atmospheric heat or solar heat is collected here and stored in the heat storage means 19. Therefore, since the amount of stored heat increases, economy and convenience are improved.
[0029]
(Example 5)
FIG. 5 is a configuration diagram of a hot water supply system using bath heat according to a fifth embodiment of the present invention. In FIG. 5, reference numeral 21 denotes a flow rate detection means that detects the flow of water in the water supply pipe 5. Reference numeral 22 denotes a control means that performs control to start operation of the compressor in response to a signal from the flow rate detection means 21.
[0030]
The operation and action of the above configuration will be described.
[0031]
The flow rate detection means 21 detects that the water supply has flowed during hot water supply, sends a signal to the control means 22, starts operation of the compressor 13, and dissipates heat in the heat recovery heat exchanger 12. Therefore, when the heat storage means 19 is provided, the heat storage amount is supplemented and the heat exchange amount in the heat exchanger 4 is increased, or when the heat storage means 19 is not provided, the heat exchange amount in the heat exchanger 4 is increased. As a result, the hot water supply capacity is improved and the temperature of the heated hot water of the heating means 6 is also increased.
[0032]
(Example 6)
FIG. 6 is a configuration diagram of a heat pump bath water heating system according to a sixth embodiment of the present invention.
[0033]
In FIG. 6, reference numeral 23 denotes a bypass pipe, which is provided in parallel with the heating means 6 and includes an on-off valve 24. Reference numeral 25 denotes a flow rate detecting means for detecting the flow of water in the water supply pipe 5. Reference numeral 26 denotes a temperature detecting means for detecting the hot water temperature at which the fluid outlet of the heating means 6 and the bypass pipe 23 merge. A control unit 27 receives the signal from the flow rate detection unit 25 and controls to open the on-off valve 24 when the temperature detected by the temperature detection unit 26 is higher than a predetermined temperature.
[0034]
The operation and action of the above configuration will be described. When the hot water is discharged, the flow rate of the water in the water supply pipe 5 is detected by the flow rate detection means 25, and when the hot water temperature at the outlet of the heating means 6 is higher than a predetermined temperature, the hot water 6 is bypassed and discharged. Therefore, heat radiation when flowing through the heating means is reduced. In addition, since the distribution resistance decreases, the amount of water discharged from the terminal currant increases.
Become. In addition, since the distribution resistance decreases, the amount of water discharged from the terminal currant increases.
[0035]
(Example 7)
FIG. 7 is a block diagram of a heat pump bath water heating system according to a seventh embodiment of the present invention.
[0036]
In FIG. 7, reference numeral 28 denotes a hot water supply unit that houses the heat recovery heat exchangers 2 and 12, the heat exchanger 4, the heating means 6, the heat pump circuit 16, and the bath heat exchanger 17 in one unit.
[0037]
The operation and action of the above configuration will be described. Since the ventilation path is not secured unlike the use of atmospheric heat, it can be installed in the pipe shaft of an apartment house or installed indoors, so the degree of freedom of installation is improved.
[0038]
【The invention's effect】
As is clear from the above description, according to the present invention, the remaining hot water heat in the bathtub can be recovered up to the feed water temperature. In addition, energy can be saved, the heating means can be made smaller, and a hot water storage tank can be eliminated by collecting the remaining hot water in the bathtub and using it for preheating the heating means. In addition, it is possible to stabilize the hot water temperature and the amount of hot water supplied. In addition, the heat pump circuit can be started up quickly.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a bath heat utilization hot water supply system according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of a bath heat utilization hot water supply system according to a second embodiment of the present invention. Fig. 4 is a block diagram of a hot water supply system using bath heat according to a fourth embodiment of the present invention. Fig. 5 is a block diagram of a hot water supply system using bath heat according to a fifth embodiment of the present invention. FIG. 7 is a block diagram of a bath heat utilization hot water supply system according to a seventh embodiment of the present invention. FIG. 8 is a block diagram of a conventional bath heat utilization hot water supply system. Description】
DESCRIPTION OF SYMBOLS 1 Bathtub 2 Heat recovery heat exchanger 3 Bath pump 4 Heat exchanger 5 Water supply pipe 6 Heating means 7 Hydrothermal exchanger 8 Combustor 9 Terminal curan 10 Temperature detection means 11 Control means 12 Bath heat recovery heat exchanger 13 Compressor 14 Evaporator 15 Depressurization means 16 Heat pump circuit 17 Bath heat exchanger 18 Bath 19 Thermal storage means 20 Natural heat utilization heat exchanger 21 Flow rate detection means 22 Control means 23 Bypass pipe 24 On-off valve 25 Flow rate detection means 26 Temperature detection means 27 Control means 28 Hot water supply unit

Claims (6)

A heat pump circuit comprising a compressor, an evaporator, a decompression means, and a heat recovery heat exchanger, a bath heat exchanger having a heat exchange relationship with the evaporator, and a bathtub or a water tank communicating with the bath heat exchanger, A heat exchanger that has a heat exchange relationship with the heat recovery heat exchanger and in which the water supplied from the water supply pipe flows, a flow rate detection means that detects the flow of water in the water supply pipe, and a compressor that is operated by a signal from the flow rate detection means A hot water supply system including a control means for starting and a heating means provided in the middle of a water supply pipe between the heat exchanger and a terminal for discharging hot water.   The hot water supply system according to claim 1, further comprising temperature detection means for detecting a hot water temperature at the outlet of the heating means, and control means for controlling the output of the heating means so that the detected temperature of the temperature detection means becomes a predetermined temperature. The hot water supply system according to claim 1 or 2, comprising a heat recovery heat exchanger and a heat storage means having a heat exchange relationship with the heat exchanger. The hot water supply system using bath heat according to any one of claims 1 to 3, further comprising a natural heat using heat exchanger that collects atmospheric heat or solar heat provided in parallel with the evaporator. A bypass pipe provided with an opening and closing valve provided in parallel with the heating means, temperature detecting means for detecting the water temperature of the fluid outlet of the pre-Symbol heating means and confluence of the bypass tube, wherein the receiving a signal flow amount detecting means hot water supply system of claim 1 Symbol mounting comprising a control means for opening said closing valve when the temperature detected by the temperature detection means is a temperature higher than a predetermined temperature. The hot water supply system according to any one of claims 1 to 5 , wherein the heat recovery heat exchanger, the heat exchanger, the heating means, the heat pump circuit, and the bath heat exchanger are housed in one unit.

Images